* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  height: 5000px;
}
em,
i {
  font-style: normal;
}
li {
  list-style: none;
}
img {
  border: 0;
}
a {
  text-decoration: none;
  color: #333;
}
